Laser aim...?
At 29:30h in the movie, Shaft has accepted the job to go look for the girl. He is seen talking to numerous people in the street, with only the soundtrack playing.
It is during this walk around town that he is standing in front of Frank's Restaurant, filmed through the window of that same place. When standing behind the lettering on the window a Laser is shining on his head for a second.
What's up with that?